/Engine/Source/Runtime/Datasmith/DatasmithCore/Public/DatasmithUtils.h
Fixes all missing references, remove all unused meshes, materials, textures, etc
static void CleanUpScene ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< class [IDatasmithScene](API\Runtime\DatasmithCore\IDatasmithScene) > Scene, bool bRemoveUnused )